public void Background_OpacityTest() { BackgroundStyle target = new BackgroundStyle(); Assert.AreEqual(target.Opacity, 1.0); double opacity = 0.4; target.Opacity = opacity; Assert.AreEqual(target.Opacity, opacity); opacity = 0.8; target.Opacity = opacity; Assert.AreEqual(target.Opacity, opacity); target.RemoveOpacity(); Assert.AreEqual(target.Opacity, 1.0); }